﻿TUBERCULATE MONTIPOR^. 131 



There is a small fragment broken from the edge of a larger stock ; in the regular uniform 

 appearance of its tubercles it belongs near to the two last types, but it cannot be identified 

 with either of them. 



a. Albany Passage. CoU. Saville-Kent. (Type.) 



Near this again is another small fragment, also broken from the edge of an explanate 

 growth. An epitheca develops at a varying distance from the edge, 1 to 2 cm. The chief 

 difference lies in the tubercles, which, though somewhat of the same character, are very much 

 smaller. They have, however, the same minute graniform appearance. As in the type, the 

 streaming layer is laminate, but the edge is tlat and not curled up, and the laminate layer 

 flames up into jagged ridges and processes for a greater distance from the edge than it does in 

 the type. The fragment is small, and the full characters of the tuberculate surface are 

 perhaps not shown. 



5. Thursday Island. Coll. Saville-Kent. 92.12.1.21. 



108. Montipora expansa. 



Mampom expansa, Dana, Zooph. (1848) p. 498, pi. 45, figs. 2, 2a, 25, 2c, 2d. 



Description. — Corallum foliaceous, thin (3 to 4 mm.) and fragile, wide-spreading, often 

 dish-shaped, " a little ascending, sometimes encrusting in part," " margin undulate, scarcely 

 plicate," epitheca (?) to " within 5 cm. of the edge. 



CaKcles minute, • 5 mm. across, often " imperfectly obvallate." On the lower surface a 

 few distant tubiform calicles, 6 mm. long, closely appressed to the corallum, and in addition 

 a few scattered " cells " (= immersed calicles). 



Coenenchyma spinuloso-asperate, spinules (= tubercles) scarcely 2 mm. long. The 

 spines are trabecular upgrowths covered with long sharp secondary spines. 



Neither the description nor the figures of this coral (from Singapore) are easy to understand. 

 Dana's chief figure shows what appears to be an irregular dish -like expanse, through the middle 

 of which branches of another coral project. Around and apposed to these penetrating branches 

 the coral is drawn as having thrown up quite abruptly a few erect but irregular leaves. The 

 centre of the coral is said to have been attached. The smaller figures show the character^of the 

 coenenchyma at the edges of the erect leaves, perhaps of the turned-up edges of the main 

 expanse. The figures also show the polyp (natural size and magnified), with its white 

 " tuberculiform " tentacles. I have not succeeded in identifying any of the tuberculate 

 specimens in the National Collection with this type. 



109._; Montipora incognita. (PI. XXIV. fig. 1 ; PL XXXIV. fig. 2.) 



Description. — Corallum a horizontal, fan-shaped (? circular) expanse, with edges neither 

 tumed up nor down, surface even, with slight radial furrows which may result in perforations, 

 the edges of the open slits thus formed being reflexed on to the under surface ; 3 to 4 mm. thick 



s 2 



